Signors to said class and egbert sanderson



(N6 Model.) 2 Sheets-Sheet 1.

' W. F. GLASS & E. G. SOHWAN.

VALVE GEAR.

No. 309,333. Patented Dec. 16, 18814.

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W. P. CLASS & E. O. SGHWAN.

VALVE GEAR.

Patented Dec. 16, 1884.

(No Model.)

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XVILLIAM F. CLASS AND ERNST C. SCHWAN, OF CLEVELAND, OHIO, AS- SIG-NORSTO SAID CLASS AND ROBERT SANDERSON, OF SAME PLACE.

VALVE-G: EAR.

SPECIFICATION forming part of Letters Patent No. 309,338, dated December16, 1884.

Application filed January 31, 1882. Renewed September 152, 1883. (Nomodel.)

To all whom it may concern.-

Be it known that we, \VM. F. CLASS and Ennsr O. SOHWAN, of Cleveland, inthe county of'Cuyahoga and State of Ohio, haveinvented certain new anduseful Improvements in Valve Gear for Steam-Engines; and we do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to whichitpertains to make and use it, reference being had to the accompanyingdrawings, which form part of this specification.

Our invention relates to an improvement in steam-engines; and itconsists, first, in an oscillating valve which is cut away upon oppositesides, and which has an opening through its center which communicateswith an opening through one end of its stem, through which theexhauststeam escapes; second, in the combination of an oscillating valveof suitable construction, a pivoted rocking lever which shifts the valveback and forth, and which le ver is operated by means of a sliding rodwhich is connected to the piston.

The object of our invention is to provide an oscillating valve whichallows the water or steam to entirely surround the valve in the valvechamber to prevent any side pressure or friction, and which is made toexhaust the water and steam through its center and one end, so thatthere will be neither side nor end pressure produced upon the valve. L

Figure l is a side elevation of my invention complete, the valve-chamberbeing seen in section. Fig. 2 is aplan view of the mechanism forshifting the valve. Fig. 3 is a vertical crosssection of the valve. Fig.at is a longitudinal vertical section of the same.

A represents the cylinder, and B the piston rod, which is connected tothe piston in the usual manner. Connected to each head of the cylinderis an inlet and outlet pipe, 0, through which the steam or water bywhich the engine is to be operated is both taken into ,the cylinder andexhausted therefrom. Each one of the pipes C is made in two parts, andthese parts are connected together by means of a flanged coupling, E, sothat the valve and valve-connection can beentirely removed from thecylinder at any time that it may be desired. This will be found a greatmatter of convenience in the transportation oi the engine, for it willthen take up much less room, and those parts of the valve whichextenddirectly out from the valve-chamber can be cast as a part thereof,and thus save the expense of couplings and connections at the side ofthe chamber. 4

The chamber F is made circular, and is provided with a stuiling-box ateach end, where the stem of the valve G projects through it. The valve Gis cut away upon opposite sides, while only those two portions of thevalve which have to make connections with the inlet and outlet pipesform a part of a circle. By cutting away the sides of the valve, as hereshown, the steam or water is admit-ted directly into the chamber, andfills the whole of the chamber around the valve at every point except atthe two outlet-ports, which are in contact with the sides of thechamber. 13y thus having the water or steam around the valve as itpasses toward the cylinder the pressure upon all sides is always exactlythe same, and there is neither side nor end pressure to cause anyuseless friction. The opening H, which is made directly across thecenter of the valve, is made to register with one of the pipes each timethat the valve is made to shift, and thus the exhaust water or steam ismade to pass directl y into the center of the valve and escapes throughthe longitudinal opening I, which is made through one end ofthe stem ofthe valve, and which passes outside of the chamber, and has any suitableconnecting-pipeto carry off the steam or water. As the exhaust steam orwater is taken directly into the center of the valve, it can produceneither side nor end pressure, and hence it is evident that the onlyfriction exerted upon the valve-rod is by the stuffing-box at each endof the chamber for the purpose of making a tight joint. I11 order toenable the valve to form aperfect cut-oft at each time that itis'shifted, one of the inlet and outlet pipes is connected to the sideof the cylinder slightly below the other, the difference in heightbetween the two being about three-sixteenths of an inch.

Secured to the solid end of the stem of the valve is the cranked arm L,which, extends downward, and against which arm the projections N on thesegment 0 are made to strike for the purpose of shifting the valve atevery stroke of thepiston. This segment is secured to or cast with thelever P, which is pivoted upon the top of the bed-plate, and whichleveris caused to shift back and forth upon its pivot by the sliding armQ,which is provided with suitable'proj eetions,R. This sliding arm Q isfastened to the piston-rod, and is held in suitable guides, S, which areattached to the cylinder-heads. At each stroke of the piston one of theprojections upon this sliding arm strikes against the side of the lever,and causes the lever to swing over toward the other side of the centerof its pivot, and as the pitman returns the lever is forced back again,and at each movement the valve is shifted so as to exhaust one end ofthe cylinder. W'here steam is used,there is no need of an extension ofthe lever beyond the segment,for the quick movement of the sliding armwill force it back and forth over its center; but where water is used asa motive power, the movement being so much slower, a weighted arm isfastened to the upper end of the lever. This weight is I necessaryfor-the purpose of carrying the leing rod may be provided with movableprojections,so that they can be moved nearer together or farther apart,according to the stroke desired, and thus be made to shift the valvemore slowly or quickly, as may be found necessary.

Having thus described our invention, We claim 1. The combination of thechamber F, connected upon opposite sides by means of pipes with the endsof the cylinder, and the valve G, having one of its ends made solid andthe other one hollow, so as to carry off the exhaust-steam or water, andhaving its sides cut away in such a manner that the chamber F is keptfull of steam or water,so as to entirely surround sides of the valve atall points except where the edges of the valve come in contact with thesides of the chamber, substantially as shown and de scribed. I

2. The combination of an oscillating valve which is provided with acranked arm, a

rocking lever provided with a segment and projections for strikingagainst the cranked arm, and asliding rod which is connected to thepiston-rod, the sliding rod being provided with projections for rockingthe lever, substantially as specified.

In testimony whereof we affix our signatures in presence of twowitnesses.

\VILLIAM F. CLASS. ERNST G. SOHWAN. \Vituesses:

T. H. JOHNSON, E. J. TI-IOBABEN.

